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