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