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