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