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