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