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)(17,18,22,26)(19,23,28,31)(20,24,25,21)(27,29,30,32)(9,10)(11,15)(12,14)(13,16)(18,20)(21,24)(23,30)(25,26)(27,31)(29,32) involution — undirected(1,3,5,4)(2,6,7,8)(9,11,12,16)(10,13,14,15)(17,19,22,28)(18,23,26,31)(20,30,25,27)(21,29,24,32)(11,16)(13,15)(17,20)(18,24)(19,27)(21,26)(22,25)(23,29)(28,30)(31,32) involution — undirected(1,4,5,3)(2,6,7,8)(10,14)(13,15)(19,28)(23,31)(27,30)(29,32)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.