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