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