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