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