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