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