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