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