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