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