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