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