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