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