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