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