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