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