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