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