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