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