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