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