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