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