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