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