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