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