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