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