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