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