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)(21,22,27,26)(23,28,32,35)(24,25,29,33)(30,31,34,36)(5,7,10,16)(6,11,13,14)(8,15,9,18)(12,19,17,20)(21,23)(22,28)(24,31)(25,34)(26,35)(27,32)(29,36)(30,33)(2,4)(21,24,26,33,27,29,22,25)(23,30,28,31,32,34,35,36)(5,8,10,9)(6,12,13,17)(7,15,16,18)(11,19,14,20)(5,9,10,8)(6,12,13,17)(7,15,16,18)(11,20,14,19)(21,25,22,29,27,33,26,24)(23,31,35,30,32,36,28,34)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.