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