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