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