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