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