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