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)(17,18,21,23)(19,27,28,42)(20,25,32,38)(22,35,34,26)(24,36,37,30)(29,43,31,45)(33,48,47,41)(39,46,40,44)(1,2)(3,8)(4,6)(5,7)(9,11)(10,14)(12,16)(13,15)(18,23)(19,28)(25,38)(26,35)(29,31)(30,36)(41,48)(44,46) involution — undirected(10,12)(11,15)(17,19,21,28)(18,24,23,37)(20,31,32,29)(22,36,34,30)(25,40,38,39)(26,42,35,27)(33,44,47,46)(41,43,48,45)(1,3,5,4)(2,6,7,8)(9,12,13,10)(11,14,15,16)(17,20)(18,25)(19,29)(21,32)(22,33)(23,38)(24,39)(26,41)(27,43)(28,31)(30,44)(34,47)(35,48)(36,46)(37,40)(42,45)(1,4,5,3)(2,6,7,8)(11,15)(14,16)(18,23)(20,32)(24,37)(26,35)(27,42)(29,31)(33,47)(44,46)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.