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)(21,22,26,29)(23,30,32,36)(24,28,25,34)(27,31,35,33)(5,7)(6,10)(8,14)(9,13)(11,18)(12,17)(15,20)(16,19)(21,23)(22,27)(24,33)(25,31)(26,32)(28,36)(29,35)(30,34) involution — undirected(2,4)(7,13)(10,17)(14,19)(18,20)(21,24,26,25)(22,28,29,34)(23,31,32,33)(27,30,35,36)(7,13)(10,17)(14,19)(18,20)(22,29)(23,32)(28,34)(31,33) involution — undirected(5,8,9,16)(6,11,12,15)(7,14,13,19)(10,18,17,20)(22,29)(27,35)(28,34)(30,36)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.