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