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