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