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