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