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