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