One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,7)(5,8)(17,18)(19,25)(20,24)(21,23)(22,26)(27,32)(28,30)(29,31) involution — undirected(1,3,6,2)(4,7,5,8)(9,10)(11,15)(12,14)(13,16)(18,23)(19,26)(24,31)(27,28)(9,11)(10,13)(12,16)(14,15)(17,19,25,18,21,26,22,23)(20,28,32,31,29,27,30,24)(1,4,6,5)(2,7,3,8)(10,14)(11,16)(17,20)(18,24)(19,27)(21,29)(22,30)(23,31)(25,32)(26,28)(1,5,6,4)(2,7,3,8)(10,14)(13,15)(18,23)(19,26)(20,29)(30,32)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.