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