One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,6,8)(3,7,11,15)(4,9,10,5)(12,13,14,16)(17,18,23,27)(19,28,21,24)(20,22,26,25)(29,32,31,30)(33,34,38,37)(35,39,41,43)(36,40,44,45)(42,46,47,48)(1,3)(2,7)(4,14)(5,13)(6,11)(8,15)(9,16)(10,12)(17,19,23,21)(18,24,27,28)(20,29,26,31)(22,30,25,32)(33,35)(34,39)(36,42)(37,43)(38,41)(40,46)(44,47)(45,48)(2,8)(3,11)(5,9)(12,14)(20,26)(22,25)(29,31)(30,32)(35,41)(36,44)(39,43)(40,45) involution — undirected(1,3)(2,7)(4,14)(5,13)(6,11)(8,15)(9,16)(10,12)(17,20,23,26)(18,25,27,22)(19,29,21,31)(24,32,28,30)(33,36,38,44)(34,40,37,45)(35,42,41,47)(39,46,43,48)(1,4,6,10)(2,9,8,5)(3,12,11,14)(7,13,15,16)(17,21,23,19)(18,24,27,28)(20,29,26,31)(22,32,25,30)(33,37,38,34)(35,43,41,39)(36,40,44,45)(42,46,47,48)(1,5,6,9)(2,10,8,4)(3,13,11,16)(7,12,15,14)(17,22,23,25)(18,26,27,20)(19,30,21,32)(24,31,28,29)(33,35)(34,39)(36,42)(37,43)(38,41)(40,46)(44,47)(45,48)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.