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