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