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