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