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