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