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