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