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