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