One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,11)(4,15)(5,16)(6,10)(7,14)(8,13)(9,12)(17,18,23,26)(19,27,20,24)(21,22,25,32)(28,31,30,29)(33,34,39,36)(35,40,46,43)(37,47,45,41)(38,42,44,48)(1,3)(2,7)(4,12)(5,13)(6,14)(8,9)(10,11)(15,16)(19,20)(24,27)(28,30)(29,31)(33,35)(34,40)(36,43)(37,44)(38,45)(39,46)(41,42)(47,48) involution — undirected(17,19,23,20)(18,24,26,27)(21,28,25,30)(22,29,32,31)(33,34,39,36)(35,43,46,40)(37,41,45,47)(38,42,44,48)(1,4,6,13)(2,8,10,15)(3,12,14,5)(7,9,11,16)(17,20,23,19)(18,24,26,27)(21,30,25,28)(22,29,32,31)(33,36,39,34)(35,43,46,40)(37,47,45,41)(38,42,44,48)(1,5,6,12)(2,9,10,16)(3,13,14,4)(7,8,11,15)(17,21,23,25)(18,22,26,32)(19,28,20,30)(24,29,27,31)(33,37,39,45)(34,41,36,47)(35,44,46,38)(40,42,43,48)(1,2)(3,7)(4,15)(5,9)(6,10)(8,13)(11,14)(12,16)(17,22)(18,25)(19,29)(20,31)(21,26)(23,32)(24,30)(27,28)(33,38,39,44)(34,42,36,48)(35,45,46,37)(40,41,43,47)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.