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