One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(17,18,23,26)(19,27,29,20)(21,24,31,32)(22,30,28,25)(1,3,4,8)(2,5,6,7)(9,10)(11,13)(12,14)(15,16)(17,19,28,31,23,29,22,21)(18,24,30,20,26,32,25,27)(2,6)(3,8)(9,11,12,15)(10,13,14,16)(17,20,23,27)(18,19,26,29)(21,30,31,25)(22,24,28,32)(2,6)(5,7)(10,14)(13,16)(19,29)(20,27)(21,31)(24,32) involution — undirected(2,6)(5,7)(17,21,28,19,23,31,22,29)(18,20,30,32,26,27,25,24)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.