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