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