One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,17)(8,22)(9,16)(10,13)(11,15)(12,20)(14,23)(18,32)(19,28)(21,26)(24,30)(25,29)(27,33)(31,34)(35,36) involution — undirected(5,7,9,20,10,19,11,21)(6,12,15,17,13,26,16,28)(8,18,23,34,24,33,25,35)(14,27,22,31,29,32,30,36)(1,2,3,4)(6,13)(12,26)(14,29)(15,16)(17,28)(22,30)(27,32)(31,36)(5,8)(6,14)(7,18)(9,23)(10,24)(11,25)(12,27)(13,29)(15,22)(16,30)(17,31)(19,33)(20,34)(21,35)(26,32)(28,36) involution — undirected(7,19)(12,26)(17,28)(18,33)(20,21)(27,32)(31,36)(34,35) involution — undirectedA 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.