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