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