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