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