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