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