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