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