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