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