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