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