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