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