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