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