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