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