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