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