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